Linksys router help

Hello, im having problems with my linksys router,i have two desktop pc i want to get hooked up to the router so both desktop pc can access the internet. i don't want to make it wireless because i have both desktop pc beside each other, i have 3 blue Ethernet cords the working desktop im on now is connected to back of my pc to port 1,other cord hooked up back of the cable modem box to internet port back of router and the last cord hooked up through back of the other desktop pc the one that can't connected into port 2. only problem is the one that has no internet saids im connected and i click on the internet said address not found,i saw the status of the conenction its receiving and sending it shows it.,i even tried to go to the router screen to see what im doing wrong but im not sure what to do.I've been trying to do this for 3 days,i even talked to the tech support online and i told them i dont want to make it wireless but i really need the help right now on how to make both desktop pc run off the same router im not sure what settings and config to adjust it to on the router screen when i enter the router password admin can someone please help!!